2003 ford e-350 15 passenger xlt van

when I turn on air conditioning cold air comes out front vents like it's suppose to, but, hot air comes out all of the back vents. the rear control switch has no effect on the problem. the low to high fan switch works on everything but no cold air in back.brand new problem, what's up?

my 93 E-350 Extended turn signals quit working. I used to be able to get them to work if I pulled the turn signal toward me and held it but now it's gone totally out. Brake lights work, haven't tried ...